The Masonry Layout seemingly works fine on computer devices.
1. I don’t use any shortcodes
2. I added a gallery with masonry style within a widget
3. the url is: lucky-muenchen.de/bildergalerie

If you go on this website on a mobile device, the masonry layout doesn’t work properly. If you put the mobile device horizontally, it works perfectly fine (3 columns, pictures rearrange the same way as on the computer). When you put the mobile device upward, vertically, the pictures seem no not arrange appropriate and there are gaps in free spaces in between the pictures.

I checked your site here and found that you are not using our plugin in that url yet. So far i can other Gallery Masonry plugin there. Also, our plugin so far doesn’t work without using shortcode. With our plugin only way to integrate masonry is using shortcode.